Smart Structures and Systems

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Full-scale experimental verification on the vibration control of stay cable using optimally tuned MR damper

  • Huang, Hongwei (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University) ;
  • Liu, Jiangyun (China Resources Land (Wuhan) Limited) ;
  • Sun, Limin (Department of Bridge Engineering, Tongji University)
  • Received : 2013.10.23
  • Accepted : 2015.09.17
  • Published : 2015.12.25
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Abstract

MR dampers have been proposed for the control of cable vibration of cable-stayed bridge in recent years due to their high performance and low energy consumption. However, the highly nonlinear feature of MR dampers makes them difficult to be designed with efficient semi-active control algorithms. Simulation study has previously been carried out on the cable-MR damper system using a semi-active control algorithm derived based on the universal design curve of dampers and a bilinear mechanical model of the MR damper. This paper aims to verify the effectiveness of the MR damper for mitigating cable vibration through a full-scale experimental test, using the same semi-active control strategy as in the simulation study. A long stay cable fabricated for a real bridge was set-up with the MR damper installed. The cable was excited under both free and forced vibrations. Different test scenarios were considered where the MR damper was tuned as passive damper with minimum or maximum input current, or the input current of the damper was changed according to the proposed semi-active control algorithm. The effectiveness of the MR damper for controlling the cable vibration was assessed through computing the damping ratio of the cable for free vibration and the root mean square value of acceleration of the cable for forced vibration.

Keywords

Acknowledgement

Supported by : Ministry of Science and Technology of China

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